Here is some supposing. One day a little T-rex(we'll call him Tinker)was sitting in his nest eating a duck-billed catch. Then dad comes back from a hard day of unsuccesful hunting and sees his son. Dad goes balistic (how many times have I told you not to eat in the nest?)! He devours Tinker! This story is some supposing from some scientist they got from the bones they found and how they were arranged.